Tree of PoRs

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It's time to select the next set of students who will be part of Saastra 2020! (The same goes for Shaarang, but nobody cares about them anyway.) The set of students who organised Saastra 2019 will be influential in this selection, and many of them will actually be applying to join next year as well. The structure of the Saastra 2019 organisation is a tree with $n$ students, rooted at student $1

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solution.cppC++17

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